Sharpening device



F. A. CHENETTE.

SHARPEHING DEVICE.

APPucATmn FILED use. 4. 1919.

' 1,368,218. Patented Feb. 8,1921.

2 SHEETS-SHEET I.

With? F. A.. CHENETTE.

SHARPENING DEVICE.

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1,368,218. Pabmea Feb. 8,1921;

2 SHEE TTTTTTTT 2.

FRANK A. CHENE'ITE. F WORCESTER, MASSACHUSETTS.

SHARPENING DEVICE.

Specification of Letters Patent.

Patented Feb. 8, 1921.

Application filed December 4, 1919. Serial No. 342,416.

To all whom it may concern Be it known that I, FRANK A. Cnnnnrrn, a citizen of the United States, residing at Worcester, in the county of l Vorcester and State of Massachusetts, have invented a new and useful Sharpening Device, of which the following is a specification.

This invention relates to a device for sharpening shears, carpenterstools, such as chisels, plane blades and the like, also meat cutter blades, and various other edge tools. It relates to that type of sharpener-s in which a stone or other sharpening device is guided at one end by a guide and rests on the blade at the other end.

The principal objects of the invontion are to provide such a device with improved means for holding a blade, particularly the blade of a pair of shears; means connected with and supported thereby for accurately holding such tools as chisel or plane blades and locating the same accurately and clamping them firmly; and to provide improvements in the stone-holding and guiding device by which the stone, whether naturalor artificial, is effectively held in a holder which will retain its shape and its grip on the stone.

Further objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings, in which,

Figure 1 is a side view of a preferred em bodiment of'this invention showing parts in central section; n

Fig. 2 is a sectional view on the line 2 2 of Fig. 1 showing the'blade holder in side elevation;

Fig. 3 is a view of a part of the stone and holder looking in the direction of the arrow 3 in Fig. 1 with parts in section;

Fig. 4: is a sectional view on the line 4-4 of Fig. 2;

Fig. 5 is a plan of the device showing it as used for sharpening a rotary meat cutter blade;

Fig. 6 is a sectional view on the 1111s 6-6 of Fig. 5 with parts in elevation Fig. 7 is an end view of the device showing it as used for holding a pair of shears for sharpening, and

Fig. 8 is an inside elevation of the shea holding jaw on enlarged scale.

The invention is illustrated in a form in whichit involves a frame consisting of a single forging or piece of malleable iron. Itcan be formed of bar-stock bent .in two places so as to form a base 10 and two upright standards 11 and .12 integral with the base and obviously of extremely simple construction. This is clamped to a table 13 or the like by an ordinary clamp 14: of any desired character.

The upright 12 is provided with a perforation through which passes a bolt 15 having a winged nut 16 on one end, and a square shoulder under the head at the other end. On this is guided a guide member 1'7 which has a longitudinal slot fitting the square shoulder and a guide eye 19. This guide 17 therefore can be raised and lowered and swung sidewise to any desired angular position.

At the other end of the base 10 the standard 11 is also provided with a perforation through which passes a bolt 20 having a.

winged nut at one end and a square shoulder under the head at the other end. Connected with this upright 11 is a jaw Elwhich is provided with a pin 22 entering a perfori tion through the upright. This jaw is provided with a tapered groove 23 for receiving the outer surface of a shear blade, and the upper end of the upright 11 is slanted-off at 24: to constitute another jaw for receiving the inner or rear side of a shear blade as indicated more fully in Fig. 7. The square shoulder and pin 22 hold the jaw so that it can be loosened and tightened by a parallel motion to clamp a shear blade B in an effective manner. The jaw 24 is discontinued at the center by providing a space 25 so that the shear blade can be gripped at the two edges of the aw and avoid any chance of its being gripped only in one spot, this positively preventing a rocking motion.

Although the above described jaws constitute a feature of this invention :1 have provided means whereby other articles can be sharpened on this device without materially changing it. F or that purpose the bolt 20 is made longer than would be necessary to simply hold the jaw 21,.and under the head, but on the square shoulder, is mounted a support 27 having a central slot 28 fitting the square shoulder so that it is capable of being raised and lowered but always kept central. This is bent over at 29to form a suitable angle for the purpose intended.

This part 29 constitutes a supporting above the center of the holder.

plate, and it is provided with a winged nut 30 and bolt 34 and with a plate 81 parallel with it and held from it by a spring 32 so that it normally rests against the underside of the head of the bolt 34. A pair of pins 33 enter perforations in the plate or jaw '31 and not only constitute a guide for that plate to hold it always in proper position, but also constitute guides for an article to be ground, such as a chisel A, plane blade or the like. When the blade A is placed against the guide pins 33 the jaw 31 is brought down into proper position by means of the winged nut on the bolt 34. This keeps it parallel with the jaw 29 and causes it to grip the flat blade tures of novelty. It comprises a holder 40' preferably made of bar metal and turned up at each end to form two integral end memhere 41. One of these is provided with a screw threaded perforation practically at the center for a guide rod 42 which is intended to pass through the guide eye 19. This rod extends inside the end piece 41 and against a wooden holding member 43 which engages the stone 44 at the end and helps hold it in position.

There is another similar wooden member 43 at the other end and a handle 46 is provided with a screw threaded shank 45 which passes through that end 41, engages this member 43, and clamps them together against the ends of the stone. It is to be noted that, the handle rod 45 is located This is to insure that its pressure will come against the stone above its center and have less tendency to pry apart the two end pieces 41.

The provision of the wooden pieces 43 is a feature of importance because it permits of a non-metallic gripping surface at eachend of the stone to hold it in fixed position and prevent its dislodgment from the holder.

The device has many uses, two of which have been described above in connection with the chisel or planer blade A, and the sharpening of shear blades B as shown in Figs. 7 and 8.

Another cutting tool that can be sharpened is a rotary cutter C used on meat slicing or grinding machines. The use of the device for this purpose is indicated in Figs. 5 and 6, in which the blade to be sharpened is held in the same way as the shear blade. But on account of its slanting shape the stone has to be slanted, consequently the guide member 17 is turned on its pivot over to one side as indicated in these figures to give the proper slant to the stone and permit it to sharpen the edge in exactly the proper manner.

The use of the device, whether for any of the purposes illustrated herein or for any other analogous purpose, is very simple and can be understood by any one. By the adjustment of the guide 17 the device can be brought into proper condition to sharpen a shear or other blade to the same angle as that at which it has been sharpened before, thus saving a great deal of work. Also the holder 27 can be raised and lowered as desired and the proper angle secured there by the adjustment of the guide 17. I prefer to use an oil stone, although other sharpening surfaces can be employed if desired.

Although I have illustrated and described only a single form'of the invention 1 am aw. re of the fact that modifications can be made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claims. There fore I do not wish to be limited to all the details of construction herein shown and described, but what I do claim is 1. In a sharpening device, the'coinbination of a frame having a guide at one end, with a detachable supporting member carried at the other end and provided with a pair of jaws angularly disposed thereon for gripping a blade to be sharpened and supporting the sharpening stone, one of said jaws being parallel with the other and adjustable toward and from it, a pair of guidingpins fixed to one of said jaws and passing through the other to guide the movable jaw, and also constituting a guide for the side edge of the blade to be sharpened, and a sharpening stone having a guide rod adapted to be guided by said guide when the stone rests on a blade carried by said jaws.

2. In a sharpening device, the combination of a guide, a detachable support provided with a pair of relatively movable jaws angularly disposed thereon for gripping a blade to be sharpened and supporting the sharpening stone, a pair of guidingpins fixed to one of said jaws and passing through the other to guide the movable jaw, and also constituting a guide for the edge of the blade to be sharpened, means for adjusting the distance between the two jaws, adjustable means at the side opposite that at which the blade is clamped for forcing the jaws apart at that side and thus clamping the blade in position, and a sharpening stone adapted to rest on a blade carried by said jaws and to be guided by said guide.

3. In a sharpening device, the combina tion of a frame having a guide at one .end for a sharpening stone, with a detachable member carried at the other end and provided with a pair of jaws disposed at an in clination thereon for gripping a blade to be sharpened and supporting the sharpening stone, one jaw being adjustably connected with the other and movable parallel therewith, and a spring for holding it away from the other jaw.

4. In a sharpening device, the combination of a frame consisting of a fiat base and two standards at the ends thereof formed of a single piece of bar iron, a guide mounted on one standard, adjustable up and down and sidewise, the other standard being beveled off at the top to constitute a jaw, a movable jaw adapted to be clamped against a blade thereon, and a sharpening member guided by said guide.

5. In a sharpening device, the combina tion of a frame comprising a flat base and end standards formed of a single piece of bar iron, a guide adjustably mounted on one standard, the other standard constituting a jaw, and a movable jaw adapted to be clamped against it to hold a blade thereon, the fixed jaw having a groove extending along it and having a space halfway between its ends for the purpose described.

6. In a sharpening device, the combination of a frame having two vertical standards integral with each other, a guide adjustably mounted on one standard, the other standard being shaped at the top to constitute a jaw, a movable jaw adapted to be clamped against it to hold a blade thereon, the upright standard on which said jaw is located having a perforation therethrough, the movable jaw having a pin fixed thereto and entering said perforation and being provided with a square perforation above it, and a bolt having a square shoulder under its head fitting in said square perforation and having a winged nut on the opposite end for clamping the jaws.

'7. In a sharpening device, the combination of two vertical standards formed integral with each other, one standard being shaped at the top to constitute a jaw, a movable jaw adapted to be clamped against said jaw to hold a blade thereon, an adjusting bolt on the other standard having a square shoulder, a guide having a longitudinal slot by which it is adjustably mounted and held by said bolt, and a sharpening stone guided by said guide.

In testimony whereof I have hereunto afiixed my signature.

' FRANK A. CHENETTE. 

